PCV vs catch can vs second breather

[5Petes]

Looking for thoughts or reviews on the PCV issues with the 3.6. I understand the catch can options and kits available but I don’t feel they fix the problem of oil getting past the PCV and into the intake once the can fills up. I’ve searched and can’t find much input on the breather options other than the marketing materials for the companies.
It looks like teraflex has an updated kit and UPR has a breather. Anyone using these or seen them work in real life? I’m also open to anyone who has a permanent fix to the PCV being in the back of the valve cover allowing oil to pass on inclines.

Teraflex
https://teraflex.com/jl-jt-3-6l-crankcase-vent-system-kit.html#

UPR
https://www.uprproducts.com/19-21-3...e-way-valve-cover-crankcase-breather-kit-upr/

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[19 JLUR Bright Whit3]

I empty my can at about every 3 gas fill ups. I have never had it more than a quarter full. ?‍

 

[5Petes]

I empty my can at about every 3 gas fill ups. I have never had it more than a quarter full. ?‍

I’m more thinking about the off road incline situations when the PCV vacuum allows oil to be sucked into the intake.

 

[19 JLUR Bright Whit3]

I’m more thinking about the off road incline situations when the PCV vacuum allows oil to be sucked into the intake.

And the can prevents that. There are a lot of opinions for and against having the can. I added it after seeing a YT video of someone on a steep incline billowing white smoke. I wheel and have never had oil burn-off. Just my $.02.
Sorry, I'm not answering your question.
No, I dont have or have ever used a breather.?

 

[5Petes]

And the can prevents that. There are a lot of opinions for and against having the can. I added it after seeing a YT video of someone on a steep incline billowing white smoke. I wheel and have never had oil burn-off. Just my $.02.
Sorry, I'm not answering your question.
No, I dont have or have ever used a breather.?

No problem. I know you’re just trying to help. I have no problem putting the can on but when out it will get hot and I won’t be able to check it after every couple climbs. I’ve read all the catch can threads I’ve found on here but they don’t seem to be the full solution as folks have smoke return after it fills up.

My mind is more thinking permanent fix for the bad/low PCV location in the first place driving the curiosity for a secondary breather. I’m concerned, maybe overly, about hydro locking and real damage over smoke that looks bad.

 

[fourseasons1621]

I just emptied my Mishimoto catch can after 3k miles and got 5oz of oil out. its insane that much oil is introduced into the intake under normal circumstances 3.6L non Etorque

 

[19 JLUR Bright Whit3]

I guess what I was trying to relay is its hard to fill the can while out wheeling. My opinion, the breather is introducing oil gases to collect in your engine bay.

 

[jaymz]

I don’t see how a breather is going to prevent your PCV from sucking oil into the intake. All it supposedly does is vent excess crankcase pressure to the atmosphere. It has no oil control capability.

I’m not sure what the catch can capacity is, but from what I’ve seen I can’t imagine you’d be likely to fill one up in a single day of wheeling.

 

[fourseasons1621]

All the cans I've seen available for our JL's don't use the breather style. They're contained within a sealed can with a baffle & ball valve to drain. Nothing escapes to atmosphere

 

[Old Dogger]

We have three Wranglers, a JKR, and a JLR. My Grandson had a 2016 JKUHR. I service all three, and have never seen any oil in the air filter and housing. If one is having this issue, then it sounds like excessive blow-by to me, and these cans are just band-aids. But based on our three that I service, it is just my opinion. If these cans are really needed, then why are they not install at the factory?

 

[5Petes]

I guess what I was trying to relay is its hard to fill the can while out wheeling. My opinion, the breather is introducing oil gases to collect in your engine bay.

My experience was a lot of oil getting into the intake last two times out so that’s why I’m skeptical and gun shy that a can alone is sufficient.

 

[5Petes]

A

All the cans I've seen available for our JL's don't use the breather style. They're contained within a sealed can with a baffle & ball valve to drain. Nothing escapes to atmosphere

Agreed with the style of cans, but the Teraflex I linked is another vent path that supposedly uses a check ball to close off the rear PCV and instead allow venting out the oil fill on inclines. That concept is what I’m wondering if it’s really functional or marketing.

 

[fourseasons1621]

I could go on and on about the numerous Jeep, cars, bikes I've built , driven, maintained in the last 20 years but on our 3.6L oil would be introduced right before the throttle body so you won't find much oil in the tube or filter housing. it will mostly reside in the intake manifold itself collecting any debris that make it passed the filter along with endless hot and cold cycles causes the oil in these areas to become hard and caked. is a catch can completely necessary? Absolutely NOT! In forced induction applications with excessive positive intake manifold pressure yea than its way more important. I believe its never a factory equipped item because it requires excessive maintenance that if not drained frequently it will act as a straw sucking large amounts of oil fouling plugs and runnability issues immediately noticed by the driver. Engine damage could be done if ignored very early in a warranty period and that's no good for a corporation. As far as wheeling causing oil to back up into the intake I can't imagine what circumstance you could be vertical long enough to cause this frequently enough to raise concern but a catch can would buy you loads more time if this was a concern for you. I don't know that I would like a check valve personally. It would take you forever to realize it went bad or isn't checking properly.

 

[fourseasons1621]

I know Mishimoto did testing on wether they needed to include the right side vent into their can set up and the decided it wasn't necessary based on they had gotten no oil out of the right vent under normal and road harsh driving conditions (I was skeptical of its benefits before seeing they addressed my question about why not both valve cover vents in their development video) on an extreme incline for a period of time I'm sure that you'll have enough vacuum to draw oil out of that right cover since all the oil will be sloshed to the rear of the covers. Does Teraflex incorporate both valve cover vents into their catch can? If not I would think checking one side is pointless

 

[Tncdrew]

Catch cans are potentially more advantageous on direct injection engines such as the 2.0. The 3.6 is port injected therefore the gas/air charge will basically keep in check (cleaning action) any PCV oil introduced into the intake track.
The backside of the intake valves in a direct injection engine don't benefit from the cleaning action of fuel passing by them.
This in turn becomes a serious maintenance issue say 70-90K miles later when the intake valves in these DI engines get completely carbon fouled, and need an expensive walnut blast etc. to clean. And of course it's a reoccurring problem in DI engines.
This is a topic I don't see discussed much among the 2.0 members.... but it's coming!

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